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So am I reading this correctly??? There is NO more Transmission tune available? I just looked on their website and it still shows as an option to purchase for $250
 

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I would have to believe when they decide what they are going to continue doing, a transmission tune would be available. That doesn’t violate any EPA laws.

While I believe they could continue tuning in ways that would not defeat emissions, I think the hard part could be proving their tunes don't hinder emissions.

Frankly, under the current federal administration, I am really surprised the EPA took this step. I assumed a day would come for a crack down, but I figured we were at least a couple years away. Additionally, compared to all the diesel vehicles on the road, tuned vehicles are such an incredibly small percentage, you would think they would put their efforts toward bigger polluters. It’s kind of like the IRS going after waiters that dont claim their tips when the folks making multi-millions get no attention. Not much bang for the federal buck going after tuners and waiters... By the way, I was a bartender back in the early 90s when the IRS went hard and heavy after waiters. I claimed my tips, my girlfriend only claimed a small percentage. She got audited, fined, and put on a repayment plan. She was one of several I knew that year.
 

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If you have a link I’ll buy one right now. I don’t see how you can select one without also ordering a full tune, which is “sold out”. I tried adding the whole thing to my cart, but there is no cart.
 

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Okay so they did send me the tune file and I was able to get it installed without too much trouble. The truck is awesome, getting rid of the second and a half throttle delay alone was worth the price. When you press the pedal to the floor, it feels pretty much like the gas version (I drove a rented Z71 Colorado for three weeks on a recent business trip) I asked if I could also buy the transmission tune and they told me that “that ship had sailed”. Well, I’m glad I just got in under the wire.
Really, they won't sell a trans tune? That seems overkill. I bet you give it a few weeks or month and check back with them, they will have figured out this whole EPA thing and probably sell you one. I mean, a trans tune has NOTHING to do with emissions, so....
 

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I would have to believe when they decide what they are going to continue doing, a transmission tune would be available. That doesn’t violate any EPA laws.

While I believe they could continue tuning in ways that would not defeat emissions, I think the hard part could be proving their tunes don't hinder emissions.

Frankly, under the current federal administration, I am really surprised the EPA took this step. I assumed a day would come for a crack down, but I figured we were at least a couple years away. Additionally, compared to all the diesel vehicles on the road, tuned vehicles are such an incredibly small percentage, you would think they would put their efforts toward bigger polluters. It’s kind of like the IRS going after waiters that dont claim their tips when the folks making multi-millions get no attention. Not much bang for the federal buck going after tuners and waiters... By the way, I was a bartender back in the early 90s when the IRS went hard and heavy after waiters. I claimed my tips, my girlfriend only claimed a small percentage. She got audited, fined, and put on a repayment plan. She was one of several I knew that year.
That sounds exactly like something the government would do, wasting money chasing the small fish when you could catch one big one and go home for the day. Typical :rolleyes:
 

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Copied from another forum, a quote from GDE:

“EFI Live came out with an update on Friday that requires a tool update. We will be sending out a mass email with directions for the EFI update. After that is complete, then email us stating you are ready for new tune.

We had made tunes for a few customers a couple weeks ago before the EFI update. One customer updated the EFI over weekend, then flashed in a tuned file create before the update and this bricked the ecm. We need to ensure the tunes and tool software version align to prevent issues.”

I never got the mass email from GDE.

I bought my tune quite some time ago and didn’t install it. I have the EFI Live software, not update since then. Also, I got the 03 update but not the 03a update. I would hope, as long as I dont update the software that I will someday be able to install the tune.

Does that sound correct, just use the non-updated EFI Live software with my tune?
 

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Hi all,

Just got my 2017 Colorado diesel. Although I still have one year of warranty since it's certified used, I'm doing research regarding tunes. I read this thread for GDE as well as others for DuramaxTuners. Is GDE not selling tunes for our truck? I went to their site and it still says "Sold Out". Anyone know if this is because of the EPA cracking down on deletes or the EFI live thing? Guess I can email GDE, I'll post any info I get.

Naturally I'd like to have a tune that gives me the most safe power but not break anything when towing. I don't tow cross country or long trips like lots on this forum but I do tow a 6K race trailer about 60 miles to the track. Mostly flat at 65-70MPH. Hills in NJ are like sea level to 800ft and like 3-4% grades. I'd love to have a single tune to do it all. I had been contemplating getting the DuramaxTuners tow+ trans tune and just running it like that. But if I could get a little more with the GDE and still be safe maybe that's a better option.
 

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As others have mentioned, their customer support is very quick and responsive. Sent them an email after the above post and got the below in about 15 minutes.

We were shut down by the EPA 6 months ago. See below:

We are not able to reflash/install our tune at this time due to changes in EPA rules. Best to contact your state representative and ask them to reign in the EPA if you ever want the GDE tune. The EPA is using statute CAA 42 USC 7522 (a)(3) (A-B) to go after the after-market auto industry. We feel this rule should only cover large auto manufacturers, not older vehicles in the field.

There is an act in Congress called the RPM Act that is on the table. Please refer to below if you contact your representatives and ask them to move quickly on this bill:

Text - S.2602 - 116th Congress (2019-2020): RPM Act of 2019

Sorry for the issues. If your vehicle is registered in a different country, let us know as rules are different outside the US. We hope to have CARB/EPA certified tunes for engine and trans within 3-4 months.
 

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As others have mentioned, their customer support is very quick and responsive. Sent them an email after the above post and got the below in about 15 minutes.

We were shut down by the EPA 6 months ago. See below:

We are not able to reflash/install our tune at this time due to changes in EPA rules. Best to contact your state representative and ask them to reign in the EPA if you ever want the GDE tune. The EPA is using statute CAA 42 USC 7522 (a)(3) (A-B) to go after the after-market auto industry. We feel this rule should only cover large auto manufacturers, not older vehicles in the field.

There is an act in Congress called the RPM Act that is on the table. Please refer to below if you contact your representatives and ask them to move quickly on this bill:

Text - S.2602 - 116th Congress (2019-2020): RPM Act of 2019

Sorry for the issues. If your vehicle is registered in a different country, let us know as rules are different outside the US. We hope to have CARB/EPA certified tunes for engine and trans within 3-4 months.
They won’t sell to U.S. Customers as GDE, but are selling through a Canadian company, HD Diesel Supply. I’m sure they’ll deny it, but I would wager on it. Their tune description is word-for-word what the GDE tune is. They may sell to you, or they may tell you that you need to be a Canadian customer.

I rarely tow, but it’s nice having the multiple level tunes. My truck stays on the Sport Economy which is the 2nd most powerful and most fuel efficient. I don’t put it on the Race tune just because and the Optimized Factory isn’t really that fun, but the tow tune does come in handy when I need it. I don’t like GDE personally, but I won’t voice my opinion: I just don’t believe that an all-in-one tune is effective or safe when towing. I have other dislikes of them but it’s whatever.

Duramax Tuner is. Good emissions intact tune. American Diesel Power has a pretty good intact tune as well. MotorOps is the only Canadian company that I know for sure will sell to U.S. customers with a delete tune, if that’s what you’re looking for.
 

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So for anyone wondering what the GDE tune state looks like now. Just got the new EPA approved tune for my 2018. Got both the transmission and the engine tune. I flashed late yesterday afternoon so a bit early to talk about fuel economy, but the single most annoying feature of the truck is resolved so mission accomplished. No more torque filtering/turbo lag, at least from my limited testing last night. Also my transmission shudder hasn't been felt since I tuned the trans. The do recommend getting all the recalls completed before flashing, even that annoying Regen recall. The beta EFI software did need to be run from a laptop to flash the transmission in pass through mode as per the bug notes on the EFI software page. I'll give it a couple weeks and update again with my impressions.
 

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So a couple weeks have passed and I've got a few thousand miles under the belt thanks to an emergency trip to Denver. On the way out to Denver I was towing a car on a U-Haul auto transport, ~6500lbs on the car carrier with just about a max payload in the truck after tongue weight. On the way back it was just me and the family so a normal long haul road trip.

First my impressions: This is a pretty fun tune.
  • Noticeably more get up and go, though I haven't got a dyno to test it on.
  • Torque filtering is gone. Peddle go down --> truck go forward, no more persistent 1-2 second delays
  • Trans temps are way down, even while towing. Before my tune I usually held 190 F in my trans temp on the highway in the summer, on the trip back 175 was the temp of the day. Towing trans temps were also significantly reduced. Towing before I could see temps as high as 230 average mid 220's, but with the tune I never topped 215. It usually held about 206-208. Trans temp control is good enough I will probably scrap my plan to add an extra trans cooler.
  • My truck definitely had an off the starting line shudder about 50-70% of the time before the tune. After the tune it happens rarely. It's intermittent enough that I'm not sure if it's the shudder or just aggressively painted lines on the road way and hitting them just right. Intentionally reproducing my shudder has become impossible and it is much more infrequent. Hopefully this will let me get more life out of the torque converter. My trans shop will probably be mad at GDE. :)
  • She's got a bit more rumble to her now that the engine lugs more often. I personally like the sound, but if you want to hear engine's scream constantly you'll want to look else where.
  • The shifting pattern feels much more like a manual rather than trying to feel like a CVT. You can definitely feel when the gears change due to the shift happening earlier and thus the engine needing to catch up right after the gear shift. This doesn't bother me, but it might bother you.
  • My towing MPG was better than the last time I pulled a similar set up. Nov last year I moved 5,500 lbs via u-haul auto transport to Denver and averaged about 15 MPG on the way there, this trip was heavier (6500 lbs) and I averaged 17.5.
  • Highway MPG are slightly higher, IIRC last Nov's return trip scored 30.4 MPG and this trip scored 31.8.
  • Note: all MPG numbers are based on the DIC. I did not do pump math because I was using different pumps and filling at various levels to make sure I didn't run out and didn't waste time when I was already stopped for things like bathroom or lunch.
  • Towing up steep inclines (6-7%) on I-24 in TN I did not have any issues holding 65 MPH or accelerating after getting cut off. I did have to slow down and move right because of lane restrictions (I had more than 3 axles) but not due to lack of power or falling behind.
  • Around town MPG isn't fair to compare thanks to the Rona. My daily driving from before COVID is very different from my current driving so I can't fairly compare them. Maybe when things settle down and I get back to driving to the office I can compare in town mileage. (no I haven't bothered to keep track of in town mileage since March because I knew it'd be terrible. Can't get any efficiency going to the store once or twice a week)
  • The turbo definitely kicks on more often. This one doesn't bother me but if you hate the turbo sounds you might need to consider another option.
  • I hit an off road trail today and I honestly couldn't tell a difference. Had as much fun as always, truck had all the power and torque it needed to. I'm not sure if I should have felt a difference, but I also only shoot for moderate trails. I don't have a ZR2 and it is my daily driver. Snapping an axle or anything like that would be a real problem for me so I avoid anything extreme.
 
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